Communications related methods and apparatus

ABSTRACT

Methods and apparatus for efficiently communicating network connectivity information in a communications system are described. Two types of signals with different characteristics, e.g., long range synchronous beacons, e.g., LTE-D beacons, and short range asynchronous beacons, e.g., WiFi beacons, are used in combination to advertise network connectivity information and accelerate the acquisition of a routing path for a communications device to a device serving as a gateway for a infrastructure network. Reception of a first type signal triggers monitoring for a second type signal, and a received second type signal communicates information used to determine a communications path to a gateway device.

RELATED APPLICATIONS

The present application claims the benefit of U. S. Provisional PatentApplication Ser. No. 62/201,508 filed Aug. 5, 2015 which is herebyexpressly incorporated by reference in its entirety.

FIELD

Various embodiments relate to methods and apparatus establishing and/orusing communications connections in networks, and more particularly, toefficiently establishing, updating and/or changing a device to devicecommunications path.

BACKGROUND

There is an ever increasing demand for deploying and using device todevice communications networks as more devices are produced to includecommunications capabilities, e.g., with multiple alternative interfaces,and new applications are offered. In addition, there are benefits interms of cost, interference, and/or security to keeping signaling localand operating at low power levels. Therefore, a communications devicemay desire to communicate using device to device signaling whereverpossible. There may be alternative potential gateways, e.g., withdifferent quality metrics, in a local area that a communications devicemay be able to use to access an infrastructure network, e.g. cellularnetwork. It would be beneficial for a communications device to be ableto quickly and efficiently locate a currently best device to devicecommunications path to the infrastructure network.

Because of the dynamic nature of many device to device networks and theuncertainty of number of potential communications devices that may beoperating a local area at a given time, efficiently determining routingcan be problematic, e.g., as communications devices move andcommunications devices may change their operational status. It isdesirable to limit the time and energy that a communication device needsto expend on searching for information used to establish and maintain acommunications path.

In view of the above it should be appreciated that there is a need forimproved methods and/or apparatus relating to signaling used forinitiating or establishing a communications path, and/or methods andapparatus for communications path establishment and/or maintenance.

SUMMARY

Infrastructure network connectivity information is advertised via twotypes of signals, a first type signal, e.g., a long range broadcastsignal and a second type signal, e.g., a short range broadcast signal.In some embodiments, the long range signal is a long range beaconsignal, e.g., an LTE-D beacon, and the short range signal is short rangebeacon signal, e.g., a WiFi beacon. Various exemplary methods andapparatus relate to accelerating data path establishment, while limitingpower consumption, by efficiently using a combination of first andsecond type signals, said first and second type signals having differentcharacteristics. Some exemplary methods and apparatus are directed toenabling efficient handover of a communications device between differentportions of a network corresponding to different gateway devices.

An exemplary communications method of operating a first communicationsdevice, in accordance with some embodiments, includes: receiving a firstfirst type signal transmitted by an advertising device, said first firsttype signal advertising infrastructure network connectivity informationcorresponding to the advertising device; and initiating scanning for asecond type signal in response to receiving said first first typesignal. An exemplary first communications device, in accordance withsome embodiments, includes: a first type signal interface configured toreceive a first first type signal transmitted by an advertising device,said first first type signal advertising infrastructure networkconnectivity information corresponding to the advertising device; afirst type signal information recovery module configured to recoverinformation communicated in received first first type signal, saidinformation including infrastructure network connectivity information;and a second type signal scan initiation module configured to initiatingscanning for a second type signal in response to receiving said firstfirst type signal.

While various embodiments have been discussed in the summary above, itshould be appreciated that not necessarily all embodiments include thesame features and some of the features described above are not necessarybut can be desirable in some embodiments. Numerous additional features,embodiments, and benefits of various embodiments are discussed in thedetailed description which follows.

BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a drawing of an exemplary communications system including aplurality of communications devices, supporting device to devicecommunications, and a plurality of base stations, at least some of thecommunications devices may serve as gateway devices and couple a deviceto device network to a base station.

FIG. 2 illustrates a worst case scenario corresponding to the speed atwhich a data path on WiFi interface can be established from device WT 4to the top gateway WT 1 using WiFi beacons.

FIG. 3 illustrates a best case scenario corresponding to the speed atwhich a data path on WiFi interface can be established from device WT 4to the top gateway WT 1 using WiFi beacons.

FIG. 4 illustrates a worst case scenario corresponding to the speed atwhich a data path on WiFi interface can be established from device WT 4to the top gateway WT 1 401 using LTE-D beacons in combination with WiFibeacons.

FIG. 5 illustrates a best case scenario corresponding to the speed atwhich a data path on WiFi interface can be established from device WT 4to the top gateway WT 1 using LTE-D beacons in combination with WiFibeacons.

FIG. 6 is a flowchart of an exemplary method of operating acommunications device in accordance with various embodiments of thepresent invention.

FIG. 7 illustrates a sample scenario of preemptive route selection inaccordance with an exemplary embodiment.

FIG. 8 illustrates another sample scenario of preemptive route selectionin accordance with an exemplary embodiment.

FIG. 9 is a flowchart of an exemplary method of operating acommunications device in accordance with an exemplary embodiment.

FIG. 10A is a first part of a flowchart of an exemplary method ofoperating a first communications device in accordance with variousexemplary embodiments.

FIG. 10B is a second part of a flowchart of an exemplary method ofoperating a first communications device in accordance with variousexemplary embodiments.

FIG. 10C is a third part of a flowchart of an exemplary method ofoperating a first communications device in accordance with variousexemplary embodiments.

FIG. 10 comprises the combination of FIG. 10A, FIG. 10B and FIG. 10C.

FIG. 11 is a flowchart of an exemplary method of operating a firstcommunications device in accordance with various exemplary embodiments.

FIG. 12 is a flowchart of an exemplary method of operating a firstcommunications device in accordance with various exemplary embodiments.

FIG. 13 is a drawing of an exemplary communications device, e.g., afirst communications device, implemented in accordance with an exemplaryembodiment.

FIG. 14A is a first part of an assembly of modules which may be includedin the exemplary communications device of FIG. 13.

FIG. 14B is a second part of an assembly of modules which may beincluded in the exemplary communications device of FIG. 13.

FIG. 14C is a third part of an assembly of modules which may be includedin the exemplary communications device of FIG. 13.

FIG. 14 comprises the combination of FIG. 14A, FIG. 14B and FIG. 14C.

DETAILED DESCRIPTION

FIG. 1 is a drawing of an exemplary communications system 100 includinga plurality of communications devices (device 1101, device 2 102, device3 103, device 4 104, device 5 105, . . . , device L 106), and aplurality of base stations (base station 1 108, . . . , base station N1010). The base stations (108, 110) are, e.g., LTE base stations. Eachof the base stations (108, 110) are coupled to the Internet and/or othernetwork nodes, e.g., via a backhaul network. Each of the communicationsdevices (device 1 101, device 2 102, device 3 103, device 4 104, device5 105, . . . , device L 106) includes a plurality of wireless interfaces((interface 1 112, . . . , interface N₁ 114), (interface 1 122, . . . ,interface N₂ 124), (interface 1 132, . . . , interface N₃ 134),(interface 1 142, . . . , interface N₄ 144), (interface 1 152, . . . ,interface N₅ 154), . . . , (interface 1 162, interface N_(L) 164),respectively. Each of the communications devices (device 1101, device 2102, device 3 103, device 4 104, device 5 105, . . . , device L 106)includes one or more antennas ((antenna 1 116, . . . , antenna N₁ 118),(antenna 1 126, . . . , antenna N₂ 128), (antenna 1 136, . . . , antennaN₃ 138), (antenna 1 146, . . . , antenna N₄ 148), (antenna 1 156, . . ., antenna N₅ 158), . . . , (antenna 1 166, interface N_(L) 168),respectively. In some embodiments, different communications devicesinclude different number of wireless interfaces and/or different numbersof antenna. In some embodiments, the same antenna is used for multiplewireless interfaces. In some embodiments multiple antennas are used fora single wireless interface. In some embodiments, the same antenna orsame set of antennas are used for a plurality of wireless interfaces ina communications device.

In some embodiments, the communications devices (device 1 101, device 2102, device 3 103, device 4 104, device 5 105, . . . , device L 106)support both LTE and WiFi communications. In various embodiments, thecommunications devices (device 1 101, device 2 102, device 3 103, device4 104, device 5 105, . . . , device L 106) support the capability tosend and receive two types of beacon signals with different ranges,e.g., LTE-D beacon signals and WiFi beacon signals, with the LTE-Dbeacon signals having a longer range than the WiFi beacon signals.

The communications devices (device 1 101, device 2 102, device 3 103,device 4 104, device 5 105, . . . , device L 106) each have a signalquality metric (M₁ 120, M₂ 130, M₃ 140, M₄ 150, M₅ 160, . . . , M_(L)170) indicative of the device's signal quality with regard to serving asa gateway, e.g., a gateway between a device to device network and a basestation, e.g., a LTE base station. Thus, in some embodiments, the signalquality metric is an indication of the quality of the wirelesscommunications channel between the device and a base station in acellular network, e.g. an LTE network. As a communications devicechanges its location, its signal quality metric changes, e.g., a devicevery close to a base station, e.g., an LTE base station, will typicallyhave a higher signal quality metric than a device far away from a basestation.

In the example of FIG. 1, the communications devices (device 1101,device 2 102, device 3 103, device 4 104, device 5 105, . . . , device L106) currently have a signal quality metric (M₁=30, M₂=22, M₃=25, M₄=26,M₅=20, . . . , M_(L)=27). Device 1 101 with the highest signal qualitymetric is considered the top gateway. At another time, e.g., with thecommunications devices at different locations with regard to the basestations, a different communications device may have the highest signalquality metric and may be considered the top gateway.

In various examples described below exemplary LTE-D beacons andexemplary WiFi beacons are used. The differences between the two typesof exemplary beacons are included in the following Table. The exemplaryvalues shown are used in some, but not necessarily all embodiments.

WiFi LTE-D Asynchronous: Synchronous: Reception (scanning) takesReception takes very short longer time Longer interval between Shorterinterval between scans (40-60 s) reception opportunities Short range(2.5-10 s) Easier to provide data path Long range Harder to provide datapath

Various methods and apparatus, in accordance with the present invention,are applicable to other types of beacons, e.g., with the aboveproperties or with similar properties. Thus some embodiments use WiFiand LTE-D beacons. Some other embodiments use a different pair of beacontypes, e.g., Bluetooth and LTE-D beacons.

In various embodiments, data path establishment on asynchronousinterface is accelerated by using synchronous beacons. Beacons, and thephysical interfaces carrying them, can be categorized into asynchronous(e.g. wifi, Bluetooth) and synchronous (e.g. LTE-D). Asynchronousbeacons usually, but not always, operate in a distributed manner onunlicensed spectrum. Their advantage is that they are unregulated andcan be transmitted frequently. However, the receivers do not know whentransmission happen, thus the receivers need to spend more timescanning, e.g., expending power scanning. To avoid major impact onbattery life, mobile devices typically need to allow a long periodbetween scan intervals. As a result, it can take a long time before anupdate sent on asynchronous beacons is received and recovered by nearbydevices.

On the other hand, synchronous beacons usually operate in a controlledor semi-controlled manner. Participating devices need to have a commontiming source, and a method to agree on beaconing instants(opportunities). GPS and cellular timing are the two most popular timingsources. GPS is free, however it lacks indoor coverage. Cellular timingis therefore the most ubiquitous, especially for terrestrial mobiledevices. The advantage of synchronous beacons is that the receivers wakeup at a predetermined instant, listen for beacons, and can quickly goback to sleep. As a result, mobile devices can allow shorter periodbetween listening intervals without major impact on battery life.

The disadvantage of synchronous beacons is that they often operate onlicensed spectrum, which is limited and of high demand. Directcommunication on the same interface as synchronous beacons is thereforeusually not available. Once the devices discover each other, they needto go over the top (through the core network and some time the Internet)to communicate.

Various exemplary embodiments are directed to exemplary methods andapparatus utilize synchronous beacons to accelerate the establishment ofdata path on asynchronous interface.

In examples described below corresponding to FIGS. 2-5, practical valuesthat have been tested in the field in an exemplary product are used. Inother embodiments, different values may be, and sometimes are, used.Consider for the examples that WiFi transmitters send beacons every 100ms. Further consider that WiFi receivers wake up to scan for beaconsevery 60 s. Further consider that LTE-D transmitters and receiverssynchronously send/receive beacons every 10 s.

In FIGS. 2-5, M represents the signal quality metric for each device.The signal quality metric for a communications device is an indicator ofsignal quality between the communications device, which may serve as agateway for a network, e.g., a localized device to device network, and acellular base station, e.g., an LTE base station. Wireless terminal (WT)1 201 has a signal quality metric M=30, as indicated by box 205; WT 2203 has a signal quality metric M=25, as indicated by box 206; WT 3 203has a signal quality metric M=20, as indicated by box 207; WT 4 204 hasa signal quality metric M=22, as indicated by box 208. WT 1 201 has thehighest quality metric (M=30), and therefore is the top gateway. Otherdevices, which can establish a data path to WT 1 201 on WiFi, beacon outa tuple (M, H, RID). Where M is the signal quality metric of WT 1 201, His the hop count from the beaconing device to a base station via deviceWT 1 201 acting as a gateway, RID is the routable ID of device 201.Consider that the routable ID of WT 1 201=201. For example, WT 2 202,which has local signal quality metric of 25 (less than 30), beacons outon WiFi (M=30, H=2, RID=201).

FIGS. 2-3 and FIGS. 4-5 can be used to compare the speed at which a datapath on WiFi interface can be established from device WT 4 204 to thetop gateway WT 1 201, using WiFi beacons only versus the speed at whicha data path on WiFi interface can be established from device WT 4 404 tothe top gateway WT 1 401 using a combination of WiFi and LTE-D beaconswith a method in accordance with the some embodiments of the presentinvention, e.g., a method in accordance with flowchart 600 of FIG. 6.

In the examples of FIGS. 2-5 A denotes the duration between when adevice starts scanning and when its neighbor's next WiFi beacon isreceived. In a distributed system where devices are not synchronized, Acan be considered to be a uniform random variable between 0 and 100 ms,where 100 ms is WiFi beacon interval. Propagation and processing timehas been excluded from FIGS. 2-5 for clarity. In practice, propagationand processing time are negligible compared to the other time periods.

FIGS. 2-5 illustrate best and worst case scenarios of WiFi beacons onlyversus WiFi+LTE-D beacons. In drawing 200 of FIG. 2 four exemplarycommunications devices (WT 1 201, WT 2 202, WT 3 203, WT 4 204) havesignal quality metrics (M=30, M=25, M=20, M=22), respectively, asindicated by boxes (205, 206, 207, 208), respectively. Thus WT 1 201 hasthe highest signal quality metric and is the top gateway in the group ofdevices (201, 202, 203, 204). An exemplary WiFi range 209 is shown. Inthis example, WT 1 201 and WT 2 202 are in WiFi range of one another; WT2 202 and WT 3 203 are in WiFi range of one another; and WT 3 203 and WT4 204 are in WiFi range of one another.

FIG. 2 illustrates a worst case scenario corresponding to the speed atwhich a data path on WiFi interface can be established from device WT 4204 to the top gateway WT 1 201 using WiFi beacons only. At time=0 sec212, WT 1 201 generates and starts transmitting WiFi Beacon'communicating the following information tuple (M=30, H=1, RID=201), asindicated by block 226. WiFi Beacon' is transmitted by WT 1 201 every100 msec.

At time=60 sec 214, WT 2 202 starts scanning on WiFi as indicated byblock 228. At time 60+Δ sec 214, WT 2 202 receives WiFi Beacon₁ asindicated by block 230, and then, in response, WT 2 202 generates andstarts transmitting WiFi Beacon₂ communicating the following informationtuple (M=30, H=2, RID=201), as indicated by block 232. WiFi Beacon₂ istransmitted by WT 2 202 every 100 msec.

At time=120 sec 218, WT 3 203 starts scanning on WiFi as indicated byblock 234. At time 120+Δ sec 220, WT 3 203 receives WiFi Beacon₂ asindicated by block 236, and then, in response, WT 3 203 generates andstarts transmitting WiFi Beacon₃ communicating the following informationtuple (M=30, H=3, RID=201), as indicated by block 238. WiFi Beacon₃ istransmitted by WT 3 203 every 100 msec.

At time=180 sec 222, WT 4 204 starts scanning on WiFi as indicated byblock 240. At time 180+Δ sec 224, WT 4 204 receives WiFi Beacon₃ asindicated by block 242, and then, in response WT 4 204 generates andstarts transmitting WiFi Beacon₄ communicating the following informationtuple (M=30, H=4, RID=201), as indicated by block 244. WiFi Beacon₄ istransmitted by WT 4 204 every 100 msec.

In the example of FIG. 2, the time from the first WT 1 201 transmissionof WiFi Beacon' and the reception by WT 4 204 of WiFi beacon₃ is a timeinterval of 180+Δ, and where Δ=50 msec (on average), the result is180.05 sec.

In drawing 300 of FIG. 3 the four exemplary communications devices (WT 1201, WT 2 202, WT 3 203, WT 4 204) have signal quality metrics (M=30,M=25, M=20, M=22), respectively, as indicated by boxes (205, 206, 207,208), respectively. Thus WT 1 201 has the highest signal quality metricand is the top gateway in the group of devices (201, 202, 203, 204).Exemplary WiFi range 209 is shown. In this example, WT 1 201 and WT 2202 are in WiFi range of one another; WT 2 202 and WT 3 203 are in WiFirange of one another; and WT 3 203 and WT 4 204 are in WiFi range of oneanother.

FIG. 3 illustrates a best case scenario corresponding to the speed atwhich a data path on WiFi interface can be established from device WT 4204 to the top gateway WT 1 201 using WiFi beacons only. At time=0 sec312, WT 1 201 generates and starts transmitting WiFi Beacon₁communicating the following information tuple (M=30, H=1, RID=201), asindicated by block 320. At time=0 312, WT 2 202, WT 3 203, WT 4 204,start scanning on WiFi as indicated by blocks (314, 316, 318),respectively.

At time=Δ sec 314, WT 2 202 receives WiFi Beacon₁ as indicated by block322, and then in response WT 2 202 generates and starts transmittingWiFi Beacon₂ communicating the following information tuple (M=30, H=2,RID=201), as indicated by block 324.

WT 3 203 receives WiFi Beacon₂ as indicated by block 326, and then inresponse WT 3 203 generates and starts transmitting WiFi Beacon₃communicating the following information tuple (M=30, H=3, RID=201), asindicated by block 328.

WT 4 204 receives WiFi Beacon₃ as indicated by block 330, and then inresponse WT 4 204 generates and starts transmitting WiFi Beacon₄communicating the following information tuple (M=30, H=4, RID=201), asindicated by block 332.

In the example of FIG. 3, the time from the first WT1 201 transmissionof WiFi Beacon₁ and the reception by WT 4 204 of WiFi beacon₃ is a timeinterval of A sec, and where Δ=50 msec (on average), the result is 0.05sec.

In drawing 400 of FIG. 4 four exemplary communications devices (WT 1401, WT 2 402, WT 3 403, WT 4 404) have signal quality metrics (M=30,M=25, M=20, M=22), respectively, as indicated by boxes (405, 406, 407,408), respectively. Thus WT 1 401 has the highest signal quality metricand is the top gateway in the group of devices (401, 402, 403, 404). Anexemplary WiFi range 209 is shown. In this example, WT 1 401 and WT 2402 are in WiFi range of one another; WT 2 402 and WT 3 403 are in WiFirange of one another; and WT 3 403 and WT 4 404 are in WiFi range of oneanother. An exemplary LTE-D range 410 is shown. In this example, WT 2402 and WT 3 403 are in LTE-D range of WT 1 401; WT 3 403 and WT 4 404are in LTE-D range of WT 2 402.

FIG. 4 illustrates a worst case scenario corresponding to the speed atwhich a data path on WiFi interface can be established from device WT 4404 to the top gateway WT 1 401 using LTE-D beacons in combination withWiFi beacons. At time=0 sec 412, WT 1 401 generates and startstransmitting WiFi Beacon₁ communicating the following information tuple(M=30, H=1, RID=401), as indicated by block 422. WiFi Beacon₁ istransmitted by WT 1 201 every 100 msec.

At time=10 s 414, WT 1 401 generates and starts transmitting LTE Beacon₁communicating the following information tuple (M=30, H=1, RID=401), asindicated by block 424. Note that the LTE-D beacon1 is transmitted onceevery 10 seconds and is synchronized to timing reference, but the WiFibeacon1 is transmitted every 100 msec.

WT 2 402 and WT 3 403, which are within LTE-D range of WT 1 401, receiveLTE-D beacon1 as indicated by blocks (426, 428), respectively. Inresponse to the received LTE-D beacon1, WT 2 402 and WT 3 403 startscanning on WiFi as indicated by blocks (428, 432), respectively.

At time=10+Δ sec 416, WT 2 402 receive WiFi Beacon₁ as indicated byblock 434, and then in response WT 2 402 generates and startstransmitting WiFi Beacon₂ communicating the following information tuple(M=30, H=2, RID=401), as indicated by block 436. WT 3 403 receives WiFiBeacon₂ as indicated by block 438, and then in response WT 3 403generates and starts transmitting WiFi Beacon₃ communicating thefollowing information tuple (M=30, H=3, RID=401), as indicated by block440.

At time=20 sec 418, WT 1 401 again transmits LTE Beacon₁ communicatingthe following information tuple (M=30, H=1, RID=401), as indicated byblock 442. At time=20 s 414, WT 2 402 generates and starts transmittingLTE Beacon₂ communicating the following information tuple (M=30, H=2,RID=401), as indicated by block 444. Note that LTE Beacon₂ istransmitted at 10 sec intervals and is synchronized to a timingreference. At time=20 sec 414, WT 3 403 generates and startstransmitting LTE-D Beacon₃ communicating the following information tuple(M=30, H=3, RID=401), as indicated by block 446.

WT 4 404 receives LTE-D Beacon₂ and/or LTE-D Beacon₃, as indicated inblock 448, and in response to the received LTE-D beacon or beacons, WT 4404 starts scanning on WiFi, as indicated in step 452. WT 3 403previously started transmitting WiFi Beacon₃, as indicated in step 440and is still transmitting, at 100 msec intervals, WiFi Beacon₂, asindicated in step 446.

At time=20+Δ sec 420, WT 4 404 receives WiFi Beacon₃ as indicated byblock 452, and then in response WT 4 404 generates and startstransmitting WiFi Beacon₄ communicating the following information tuple(M=30, H=4, RID=401), as indicated by block 454.

In the example of FIG. 4, the time from WT 1 401 transmission of firstWiFi Beacon₁ and the reception by WT 4 404 of WiFi beacon₃ is a timeinterval of 20+Δ sec, and where Δ=50 msec (on average), the result is20.05 sec.

In drawing 500 of FIG. 5 the four exemplary communications devices (WT 1401, WT 2 402, WT 3 403, WT 4 404) have signal quality metrics (M=30,M=25, M=20, M=22), respectively, as indicated by boxes (405, 406, 407,408), respectively. Thus WT 1 401 has the highest signal quality metricand is the top gateway in the group of devices (401, 402, 403, 404).Exemplary WiFi range 209 is shown. In this example, WT 1 401 and WT 2402 are in WiFi range of one another; WT 2 402 and WT 3 403 are in WiFirange of one another; and WT 3 403 and WT 4 404 are in WiFi range of oneanother. Exemplary LTE-D range 410 is shown. In this example, WT 2 402and WT 3 403 are in LTE-D range of WT 1 401; WT 3 403 and WT 4 404 arein LTE-D range of WT 2 402.

Drawing 500 of FIG. 5 illustrates a best case scenario corresponding tothe speed at which a data path on WiFi interface can be established fromdevice WT 4 404 to the top gateway WT 1 401 using LTE-D beacons incombination with WiFi beacons. At time=0 sec 512, WT 1 401 generates andstarts transmitting beacons including a LTE-D beacon1 and WiFi Beacon₁communicating the following information tuple (M=30, H=1, RID=401), asindicated by block 516. Note that LTE-D beacon1 will be transmitted onceevery 10 seconds and is synchronized with respect to a timing reference,and the WiFi beacon will be transmitted at 10 msec intervals.

WT 2 402 and WT 3 403, which are within LTE-D range of WT 1 401, receiveLTE-D beacon₁ as indicated by blocks (518, 520), respectively. Inresponse to the received LTE-D beacon₁, WT 2 402 and WT 3 403 startscanning on WiFi as indicated by blocks (524, 526), respectively. WT 4404 also starts scanning on WiFi, as indicated by block 522. The WT 4404 scanning start is not triggered by a received LTE-D beacon; however,WT 4's scan start timing fortuitously happens to occur at this time,e.g., without being forced to start scanning from an external event.

At time=Δ sec, WT 2 402 receives WiFi Beacon₁ , as indicated by block528, and in response WT 2 402 generates and starts transmitting WiFiBeacon₂ communicating the following information tuple (M=30, H=2,RID=401), as indicated by block 530. WT 3 403 receives WiFi Beacon₂ asindicated by block 532, and then in response WT 3 403 generates andstarts transmitting WiFi Beacon₃ communicating the following informationtuple (M=30, H=3, RID=401), as indicated by block 534. WT 4 404 receivesWiFi Beacon₃ as indicated by block 536, and then, in response, WT 4 404generates and starts transmitting WiFi Beacon₄ communicating thefollowing information tuple (M=30, H=4, RID=401), as indicated by block538.

In the example of FIG. 5, the time from WT1 401 first transmission ofWiFi Beacon₁ and the reception by WT 4 404 of WiFi beacon₃ is a timeinterval of A sec, and where Δ=50 msec (on average), the result is 0.05sec.

The results corresponding to FIGS. 2-5 are summarized in the Tablebelow, using the average value for Δ (50 ms).

WiFi only WiFi + LTE-D Best case  0.05 s  0.05 s Worst case 180.05 s20.05 s

In some other embodiments, a device starts to beacon out an LTE-D beaconas soon as the device receives an LTE-D beacon (instead of waiting untilthe next beaconing opportunity). In some other embodiments, a devicestarts to beacon out a WiFi beacon as soon as the device receives anLTE-D beacon (instead of waiting until the device receives a WiFibeacon.

FIG. 6 is a flowchart 600 of an exemplary method of operating acommunications device in accordance with various embodiments of thepresent invention. The method of flowchart 600 is performed by acommunications device receiving an LTE-D beacon, e.g., WT 402 or WT 403or WT 404 of FIG. 4 or 5.

Operation starts in step 602 in which the communications deviceimplementing the flowchart of FIG. 6 is powered on and initialized.Operation proceeds from step 602 to step 604. In step 604 thecommunications device monitors for LTE-D beacons, e.g., duringpredetermined time intervals in accordance with a schedule which issynchronized to a timing reference signal. Step 604 may, and sometimesdoes include step 606 in which the communications device receives anLTE-D beacon 605.

In response to the received LTE-D beacon 605, operation proceeds fromstep 606 to step 608. In step 608 the communications device determineswhether or not the received LTE-D beacon 605 carries any newinformation. If the determination is that the received LTE-D beacon doesnot carry new information, then operation proceeds from step 608, viaconnecting node A 607 to step 604 for additional monitoring.

However, if the communications device determines that the received LTE-Dbeacon carries new information then operation proceeds from step 608 tostep 610, in which the communications device updates information aboutthe top gateway. Operation proceeds from step 610 to step 612.

In step 612 the communications device scans on WiFi interface. Operationproceeds from step 612 to step 614. In step 614 the communicationsdevice checks as to whether or not the communications device hasreceived a WiFi beacon with updated information. If the determination ofstep 614 is that the communications device has not received a beaconwith updated information on the WiFi, then operation proceeds from step614 to step 616. In step 616, the communications device checks as towhether or not the scan timeout has been reached. If the WiFi scantimeout has been reached, then operation proceeds from step 616, viaconnecting node A 607 to step 604 for additional monitoring for LTE-Dbeacons. However, if the determination of step 616 is that the WiFi scantime timeout has not been reached then operation proceeds from step 616to step 612 for additional scanning on the WiFi interface.

Returning to step 614, in step 614 if the determination is that a WiFibeacon has been received with new information, then operation proceedsfrom step 614 to step 618. In step 618, the communications deviceupdates hop count to current top gateway. Operation proceeds from step618 to step 620, in step 620 the communications device generates a WiFibeacon with updated information. Operation proceeds from step 620 tostep 622 in which the communications device transmits the generated WiFibeacon with updated information. Operation proceeds from step 622, viaconnecting node A 607 to step 604 for additional monitoring for LTE-Dbeacons.

Various methods and apparatus in accordance with some embodiments of thepresent invention are directed to preemptive route selection. One bigchallenge in current hybrid infrastructure (with WiFi for peer-to-peerconnections, and cellular for last hop) is providing seamless handoverin the present of device mobility. As the devices move, their currentconnection may deteriorate below a useable threshold. This can happenwhen either the served device (called the node hereafter) or the servingdevice (called the relay hereafter) moves with respect to the other.Ideally, it is desirable for the node to have a fallback connection thatit can quickly switch to, so that the quality of communication is notaffected. However, this is currently not achievable in many cases.

Devices discover each other through beacons. Since the range of WiFibeacons is similar to the range of WiFi data connections, when a newconnection becomes available (e.g. because the node moves inside theWiFi data connection range of a new potential relay), the node cannotmake use of the new connection right away. It needs to wait for thediscovery and route conversion processes to finish. The discoveryprocess can incur significant delay because WiFi is asynchronous and thenode can have a long interval between WiFi scans. This delay degradesthe quality of communication.

LTE-D beacons operate on licensed spectrum, and thus have a much longerrange than WiFi beacons. Various embodiments in accordance with thepresent invention utilizes this longer range, e.g., of LTE-D beacons, toallow devices to “look ahead”.

In some embodiments, upon receiving a beacon, the device, which receivedthe beacon, compares the received power of the new beacon withpreviously received beacons from the same source. Using the time seriesof received beacon power, the receiving device can estimate its relativemotion with the beacon source. In various embodiments, the receivingdevice has a higher preference for sources to which its relative motionis one of moving closer. The receiving device includes this preferencein its list of parameters used to rank quality of routes. In someembodiments its list of parameters used to rank quality of routesinclude source cellular signal quality, load, battery level, mobility,etc.

Drawing 700 of FIG. 7, illustrates a sample scenario of preemptive routeselection in accordance with an exemplary embodiment. Three exemplarycommunications devices (WT 1 701, WT 2 702 WT 3 703) are shown, eachdevice (WT 1 701, WT 2 702 WT 3 703) including LTE and WiFi interfaces.WT 1 701 has signal quality metric M₁=20, as indicated in box 705, andis currently connected to WT 2 702 which is serving as a gateway, andwhich has signal quality metric M₂=30, as indicated in box 707. Theboundary of the maximum LTE range for WT 3 703 is indicated by dot-dashline 710; and the boundary for the maximum WiFi range for WT 3 703 isindicated by solid line 714. The boundary for the maximum WiFi range forWT 2 702 is indicated by solid line 712. Consider that WT 1 701 isinitially within both LTE-D range and WiFi range, of WT 2 702 (M₂=30).Further consider that WT 1 701 is initially within LTE-D range, but notwithin WiFi range, of WT 3 703 (M₃=30). Consider that WT 1 701 is movingas indicated by arrow 716. WT 1 701 receives LTE-D beacons from WT 3703; WT 1 701 learns that it is moving towards WT 3 703. From receivedWiFi beacons of WT 2 702 WT 1 701 learns that it is moving away from WT2 702. These conditions make the route quality metric of WT 2 702degrade below ROUTE BREAK THRESHOLD, and route quality metric of WT 3703 become the highest. Device WT 1 701 starts to actively scan on WiFi.As soon as device WT 1 701 receives WT 3 703's WiFi beacon, WT 1 701 canstart a connection procedure with device WT 3 703. Device WT 1 701 has anew signal quality metric value, M₁=22, as indicated in box 705′, at thenew location shown in FIG. 7.

Drawing 800 of FIG. 8 illustrates another sample scenario of preemptiveroute selection in accordance with an exemplary embodiment. Considerthat exemplary devices (WT 1 801, WT 2 802, WT 3 803, WT 4 804) eachinclude WiFi and LTE interfaces. Devices (801, 802, 803, 804) havesignal quality metrics (M₁=20, M₂=30, M₃=25, M₄=30), respectively.

Consider that device WT 1 801 is moving as indicated by arrow 815. Theboundary of the maximum LTE range for device WT 4 804 is indicated bydot-dash line 814; and the boundary for the maximum WiFi range fordevice WT 3 803 is indicated by solid line 818. The boundary for themaximum WiFi range for device WT 2 802 is indicated by solid line 816.

In this case, device WT 1 801 determines from received LTE-D beaconsfrom device WT 4 804 and received WiFi beacons from device WT 2 402 thatdevice WT 1 801 is moving away from its current gateway WT 2 802 towardsdevice WT 4 804. Device WT 4 804 becomes the top gateway in device WT 1801's route list, while the quality of route metric for the currentroute to device WT 2 802 degrades below ROUTE_BREAK_THRESHOLD. Device WT1 801 starts scanning on WiFi. As device WT 1 801 moves into WiFi rangeof device WT 3 803, device WT 1 801 detects from device WT 3 803's WiFibeacon that device WT 3 803 is part of the route to top gateway WT 4804. Device WT 1 801 initiates a connection procedure to device WT 3803. Device WT 1 801 has a new signal quality metric value, M₁=22, asindicated in box 806′, at the new location shown in FIG. 8.

FIG. 9 is a flowchart 900 of an exemplary method of operating acommunications device in accordance with an exemplary embodiment.Flowchart 900 describes preemptive route selection in accordance with anexemplary embodiment. The method of FIG. 9 may be performed by acommunications device, e.g., WT 1 701 of FIG. 7 or WT 1 801 of FIG. 8,including interfaces for receiving LTE-D beacons and WiFi beacons.

Operation starts in step 902 in which the communications device ispowered on and establishes a route to a gateway device, e.g., based onone or more received beacons. In step 902 the communications device alsogenerates a routing table. Operation proceeds from step 902 to step 904.

In step 904 the communications device monitors for beacons from otherdevices. The monitoring of step 904 for beacons is performed on anongoing basis, e.g., during beacon monitoring intervals. Some of thebeacon monitoring intervals may be synchronized with respect to a timingreference, e.g., beacon intervals in which LTE-D beacons can becommunicated. Other monitoring intervals may or may not be synchronizedwith respect to the external timing reference, e.g., monitoringintervals for detecting WiFi beacons. Step 904 may, and sometimes doesinclude step 906 in which the communications device receives one or morebeacon(s) 905 from another device.

Operation proceeds from step 906 to step 908 in response to a receivedbeacon. In step 908 the communications device computes relative motionof the communications device with respect to the device whichtransmitted the received beacon based on a sequence of received signalstrengths including the received signal strength of the received beacon.Operation proceeds from step 908 to step 910.

In step 910 the communications device store relative motion informationand information from other beacon fields in the received beacon inmemory in the communications device. Operation proceeds from step 910 tostep 912. In step 912 the communications device computes the quality ofroutes in the routing table including the current route. Operationproceeds from step 912 to step 914 in which the communications deviceranks the quality of routes in the routes the table. Operation proceedsfrom step 914 to step 916.

In step 916 the communications device determines if the quality of thecurrent route is below a threshold, e.g., a route break threshold. Ifthe determination is that that the quality of the current route is notbelow the threshold, then operation proceeds to return step 919.However, if the determination of step 916 is that the quality of thecurrent route is below the threshold, then operation proceeds from step916 to step 918. In step 918, the communications device determineswhether or not there are any alternative routes with higher quality thanthe current route. If the communications device determines that there isat least one alternative route with higher quality than the currentroute, then operation proceeds from step 918 to step 920.

In step 920, the communications device determines whether or not thereis WiFi information of any higher quality route available. If thedetermination of step 920 is that there is WiFi information available ona higher quality route available, then operation proceeds from step 920to step 922. In step 922 the communications device starts a connectionprocedure for the best available route for which WiFi information isavailable.

However, if the determination of step 920 is that WiFi information of ahigher quality route is not available, then operation proceeds from step920 to step 924. In step 924 the communications device scan on the WiFiinterface. Operation proceeds from step 920 to step 924. In step 924 thecommunications device checks to see if the communications device hasreceived WiFi information on a higher quality route. If thecommunications device has not received WiFi information on a higherquality route, then operation proceeds from step 926 to step 930. Instep 930 the communications device checks to determine if the scan hastimed out. If the scan timeout has been reached then operation proceedsto return step 919. However if the scan timeout has not been reached,then operation proceeds from step 930 to step 924 for more WiFiscanning.

Returning to step 926, if the communications device has received WiFiinformation on a higher quality route, then operation proceeds from step926 to step 928. In step 928 the communications device starts aconnection procedure for the higher quality route using the WiFiinformation. Operation proceeds from step 928 to return step 919.

FIG. 10, comprising the combination of FIG. 10A, FIG. 10B and FIG. 10C,is a flowchart 1000 of an exemplary method of operating a firstcommunications device in accordance with various exemplary embodiments.The first communications device is, e.g., communications device 1300 ofFIG. 13. The first communications device implementing the method offlowchart 10 is, e.g., a communications device with device to devicecapability which can receive LTE-D beacons and WiFi beacons. Operationstarts in step 1002 and proceeds to step 1004.

In step 1004 the first communications device receives a first first typesignal transmitted by an advertising device, said first first typesignal advertising infrastructure, e.g., celluar, network connectivityinformation corresponding to the advertising device. In someembodiments, the first type signal is a broadcast or multicast signal.In some embodiments, the first type signal is a wireless broadcastsignal communicating a beacon signal, e.g., a beacon frame. In someembodiments, the first first type broadcast signal is a LTE-D beacon. Insome embodiments, the advertising device is a gateway device or anintermediate device.

Step 1004 includes step 1006 in which the first communications devicereceives infrastructure network connectivity information correspondingto the advertising device. In some embodiments, said infrastructurenetwork connectivity information includes quality information about acommunication path used by said advertising device to connect to theinfrastructure network. In some such embodiments, said qualityinformation includes information about a connection between a gatewaydevice used by the advertising device and the infrastructure network. Insome such embodiments, said infrastructure network connectivityinformation includes one or more of the following: informationindicating a number of peer to peer hops between the advertising deviceand the gateway device; information on quality of said peer to peer hopsbetween the advertising device and the gateway device; informationindicating a mobility level of the advertising device; informationidentifying the infrastructure network, e.g. identifying the operator ofthe network; or information indicating a type, e.g. number of antennascoupled to the gateway device, UE category, etc., of the gateway device.

In some embodiments, said connection may be, and sometimes is, a singlehop connection to the infrastructure network. In some such embodiments,said advertising device and said gateway are the same device, and saidpath is a single hop connection to the infrastructure network.

Step 1006 includes step 1008 and 1010. In some embodiments, step 1006further includes one or more or all of steps 1012, 1014, and 1016. Instep 1008 the first communications device receives quality informationabout a communications path used by said advertising device to connectto the infrastructure network. Step 1008 includes step 1018 and mayinclude optional step 1020. In step 1018 the first communications devicereceives quality information about a connection between a gateway deviceused by the advertising device to connect to the infrastructure network.In step 1020 the first communications device receives information on thequality of said peer to peer hops between the advertising device and thegateway device.

In step 1010 the first communications device receives informationindicating a number of hops between the advertising device and aninfrastructure network node. In some embodiments, step 1010 includesstep 1022 in which the first communications device receives informationindicating a number of peer to peer hops between the advertising deviceand the gateway device. In some embodiments, the same receivedinformation is used to communicate both (i) the number of hops betweenthe advertising device and an infrastructure network node and (ii) thenumber of peer to peer hops between the advertising device and thegateway device. For example, a value communicating the number of hopsbetween the advertising device and an infrastructure network node iscommunicated in a field of the first first type signal, and the numberof peer to peer hops between the advertising device and the gatewaydevice is 1 less than that communicated value. Alternatively, a valuecommunicating the number of peer to peer hops between the advertisingdevice and the gateway device is communicated in a field of the firstfirst type signal, and the number of hops between the advertising deviceand an infrastructure network node is 1 more than that communicatedvalue.

In step 1012 the first communications device receives informationindicating a mobility level of the advertising device. In step 1014, thefirst communications device receives information identifying theinfrastructure network. In some embodiments, the information identifyingthe infrastructure network identifies the operator of the network. Instep 1016 the first communications device receives informationindicating a type of the gateway device. In some embodiments, theinformation indicating a type of the gateway device indicates a numberof antennas coupled to the gateway device. In some embodiments, theinformation indicating a type of the gateway device indicates a userequipment (UE) category.

Operation proceeds from step 1004 via one of three alternative paths,e.g., depending upon the particular embodiment, to step 1048 viaconnecting node A 1024, to step 1032 via connecting node B 1026, or tostep 1034 via connecting node C 1028.

In a first embodiment, operation proceeds from step 1004 via connectingnode A 1024 to step 1048 in which the first communications deviceinitiates scanning for a second type signal, in response to receivingsaid first first type signal. In some embodiments, the second typesignal is a broadcast signal, e.g., a WiFi broadcast signal.

In a second embodiment, operation proceeds from step 1004 via connectingnode B 1026 to step 1032, in which the first communications device makesa decision whether to switch from monitoring for second type signalsduring monitoring intervals which occur at a first time spacing tomonitoring, without waiting for the occurrence of one of said monitoringintervals, e.g., start monitoring immediately, for second type broadcastsignals, based on the content of said first first type signal. Step 1032includes steps 1036, 1038 and 1040. In step 1036 the firstcommunications checks determines if the received network connectivityinformation received in the first first type signal indicates betterinfrastructure network connectivity than is presently available to thefirst communications device. If the determination is that the receivednetwork connectivity information does indicate better infrastructurenetwork connectivity than is presently available to the firstcommunications device, then operation proceeds from step 1036 to step1038 in which the first communications device decides to monitor forsecond type signals without waiting. However, if the determination isthat the received network connectivity information does not indicatebetter infrastructure network connectivity than is presently availableto the first communications device, then operation proceeds from step1036 to step 1040 in which the first communications device decides towait for first time intervals to monitor for second type signals.

Operation proceeds from step 1036 to step 1048 in which the firstcommunications device initiates scanning for a second type signal, e.g.,a WiFi broadcast signal, in response to receiving said first first typesignal.

In a third embodiment, operation proceeds from step 1004 via connectingnode C 1028 to step 1034, in which the first communications device makesa decision whether to trigger monitoring for second type signals basedon whether or not the received network connectivity information in thereceived first first type signal indicates better infrastructure networkconnectivity information than is presently available to the firstcommunications device. In some such embodiments, the first and secondtype signals are beacon signals. Step 1034 includes steps 1042, 1044 and1046. In step 1042 the first communications checks determines if thereceived network connectivity information received in the first firsttype signal indicates better infrastructure network connectivity than ispresently available to the first communications device. If thedetermination is that the received network connectivity information doesindicate better infrastructure network connectivity than is presentlyavailable to the first communications device, then operation proceedsfrom step 1042 to step 1044 in which the first communications devicedecides to trigger monitoring for second type signals. However, if thedetermination is that the received network connectivity information doesnot indicate better infrastructure network connectivity than ispresently available to the first communications device, then operationproceeds from step 1042 to step 1046 in which the first communicationsdevice decides to refrain from triggering monitoring for second typesignals.

Operation proceeds from step 1044 to step 1048 in which the firstcommunications device initiates scanning for a second type signal, e.g.,a WiFi broadcast signal, in response to receiving said first first typebroadcast signal.

In various embodiments, a first type signal has a longer transmissionrange than a second type signal. In some such embodiments, the firsttype signal is a wireless broadcast signal that corresponds to a firstcommunications protocol, e.g., an LTED protocol, and the second typesignal is a second wireless broadcast signal that corresponds to asecond communications protocol, e.g., a WiFi protocol. In some suchembodiments, a first type signal is synchronized to a time reference,e.g., one of a global or cellular time reference or a time referencethat uses distributed time synchronization algorithms within a group ofdevices, and a second type signal is unsynchronized or synchronized to alesser degree than a first type signal, e.g., second type signals mayhave jitter or occur at less predictable time relative to the timingreference, e.g., global timing reference, being used by first typesignals.

Operation proceeds from step 1048, via connecting node D 1050, to step1052. In step 1052 the first communications device updatesinfrastructure network connectivity information corresponding to thefirst communications device based on information in said received firstfirst type signal. Operation proceeds from step 1052 to step 1054 orstep 1058, depending upon whether or not a second type signal wasdetected during the initiated scanning for second type signals. In step1054 the first communications device receives a first second typesignal. In some embodiments, the first second type signal is a signalcommunicating a WiFi beacon frame or a WiFi action frame.

Operation proceeds from step 1054 to step 1056 in which the firstcommunications device updates infrastructure network connectivityinformation corresponding to the first communications device based onthe information in said received first second type signal. Operationproceeds from step 1056 to step 1058. In some embodiments, operationalso proceeds from step 1056 to step 1059.

In step 1058 the first communications device generates a second firsttype signal advertising said updated infrastructure network connectivityinformation corresponding to the first communications device. Operationproceeds from step 1058 to step 1060 in which the first communicationsdevice transmits said generated second first type signal, e.g., an LTE-Dbeacon, advertising said updated infrastructure network connectivityinformation corresponding to the first communications device. In onescenario the first communications device has not received a first secondtype signal in step 1054 and updated network connectivity informationincluded in the second first type signal is based on information fromthe received first first type signal. In another scenario the firstcommunications device has received a first second type signal in step1054 and updated network connectivity information included in the secondfirst type signal is based on information from the received first firsttype signal and the received first second type signal.

In step 1059 the first communications device generates a first thirdtype signal advertising said updated infrastructure network connectivityinformation corresponding to the first communications device. Operationproceeds from step 1059 to step 1061 in which the first communicationsdevice transmits said generated first third type signal advertising saidupdated infrastructure network connectivity information corresponding tothe first communications device. In some embodiments, the first thirdtype signal is a different type of long range broadcast signal, e.g.,beacon, than the second first type signal, e.g., using a differentcommunications protocol and a different communications interface.

If a first second type signal was received in step 1054, then operationproceeds from step 1060 to step 1064, in which the first communicationsdevice generates a second second type signal advertising said updatedinfrastructure network connectivity information corresponding to thefirst communications device. Operation proceeds from step 1064 to step1066 in which the first communications device transmits the generatedsecond second type signal advertising said updated network connectivityinformation corresponding to the first communications device. In someembodiments, the second second type signal is a WiFi signalcommunicating a WiFi beacon frame or a WiFi action frame.

In some embodiments, operation also proceeds from step 1060 to step 1068in which the first communications device generates a first fourth typesignal advertising said updated network interconnectivity informationcorresponding to said first communications device. Operation proceedsfrom step 1068 to step 1070 in which the first communications devicetransmits the generated first fourth type signal advertising saidupdated network connectivity information corresponding to the firstcommunications device. In some embodiments, the first fourth type signalis a different type of short range broadcast signal, e.g., beacon, thanthe second second type signal, e.g., using one of: a Bluetooth, BLE,802.15.4, or 802.11ad protocol.

FIG. 11 is a flowchart 1100 of an exemplary method of operating a firstcommunications device in accordance with various exemplary embodiments.The first communication device is, e.g., device 1300 of FIG. 13. In oneembodiment, the first communications device is a device with device todevice capability which can received LTE-D beacons and WiFi beacons.Operation starts in step 1102 and proceeds to step 1104. In step 1104the first communications device receives a first first type signal,e.g., an LTE-D beacon, transmitted by an advertising device, said firstfirst type signal advertising infrastructure, e.g., cellular, networkconnectivity information corresponding to the adverting device. In someembodiments, the advertising device is a gateway device or anintermediate device that transmits an LTE-D beacon. Operation proceedsfrom step 1104 to step 1106.

In step 1106 the first communications device initiates scanning for asecond type signal, e.g., a WiFi signal, in response to receiving saidfirst type of signal. In some such embodiments, the second type signalis a broadcast signal, e.g., a WiFi beacon signal. Operation proceedsfrom step 1106 to step 1108, in which the first communications devicereceives a first second type signal from a second communications device.In some embodiments, operation proceeds from step 1108 to one or both ofoptional steps 1110 and 1112. In other embodiments, operation proceedsfrom step 1108 to step 1114.

In step 1108 the first communications device receives one or moreadditional first type signals, e.g., from the advertising device. Instep 1112 the first communications device receives one or moreadditional second type signals, e.g., from the second communicationsdevice. Operation proceeds from step 1110 and/or step 1112 to step 1114.

In step 1114 the first communications device determines a direction ofmotion relative to said advertising device based on at least one signalreceived from the advertising device. For example, the firstcommunications device determines the direction of motion based on saidfirst first type signal but also potentially other first type signals.For example, the direction of motion is determined based on the receivedfirst first type signal, e.g., a first LTE-D beacon received in step1104 and other first type signals, e.g., additional LTE-D beaconsreceived from the advertising device in step 1110, e.g., each additionalLTE-D beacon from the advertising device being received at a differenttime subsequent to the received first first type signal. In anotherexample, the direction of motion is determined based multiple secondtype signals received from the advertising device, e.g., multiple WiFibeacons received from the advertising device at different times in step1112. In still another embodiment, the direction of motion is determinedbased on multiple first type signal, e.g. multiple LTE-D beacons, andmultiple second type signals, e.g., multiple WiFi beacons, received fromthe advertising device, e.g., at different times. Operation proceedsfrom step 1114 to step 1116.

In step 1116, the first communications device makes a decision whetherto handoff from another device to said second communications devicebased on a second type signal, e.g., the first second type signal,received from the second communications device. In some embodiments, thedecision of step 1116 whether or not to make a handoff to the secondcommunications device is further based on said determined direction ofmotion relative to said advertising device. In some embodiments, for thefirst communications device to decide to make a handoff the secondcommunications device the first communications device satisfies theconditions that the first communications device is determined to bemoving in a direction toward the advertising device and the receivedsignal strength of a second type signal from the second communicationsdevice is above a predetermined threshold. Operation proceeds from step1116 to step 1118.

In step 1118 if the decision is to handoff the said secondcommunications device, then operation proceeds from step 1118 to step1120 in which the first communications device implements the handoff tosaid second communications device. However, if the decision is not tohandoff to the second communications device, then operation proceedsfrom step 1118 to the input of step 1110 and 1112.

FIG. 12 is a flowchart 1200 of an exemplary method of operating a firstcommunications device in accordance with various exemplary embodiments.The first communication device is, e.g., device 1300 of FIG. 13. In oneembodiment, the first communications device is a device with device todevice capability which can received LTE-D broadcast signals includingbeacons and WiFi broadcast signals including WiFi beacon frames and WiFiaction frames. Operation starts in step 1202 and proceeds to step 1204.In step 1204 the first communications device receives a first first typesignal, e.g., a LTE-D beacon, transmitted by an advertising device, saidfirst first type signal advertising infrastructure network connectivityinformation corresponding to the adverting device. Operation proceedsfrom step 1204 to step 1206.

In step 1206 the first communications device initiates scanning for asecond type signal, e.g., a WiFi beacon signal, in response to receivingsaid first type of signal. Operation proceeds from step 1206 to optionalstep 1208, to one or both of optional steps 1210 and 1212, or to step1214. In step 1208 the first communications device receives a firstsecond type signal, e.g., from a second communications device. In someembodiments, operation proceeds from step 1208 to one or both ofoptional steps 1210 and 1212. In other embodiments, operation proceedsfrom step 1208 to step 1214.

In step 1210 the first communications device receives one or moreadditional first type signals, e.g., from the advertising device. Instep 1212 the first communications device receives one or moreadditional second type signals, e.g., from the second communicationsdevice. Operation proceeds from step 1210 and/or step 1212 to step 1214.

In step 1214 the first communications device determines a direction ofmotion relative to said advertising device based on one or more receivedsignals. For example, in one embodiment, the first communications devicedetermines a direction of motion relative to the advertising devicebased on multiple LTE-D beacons received from the advertising device. Inanother embodiment, the first communications device determines adirection of motion relative to the advertising device based on multipleWiFi beacons received from the advertising device. In yet anotherembodiment, the first communications device determines a direction ofmotion relative to the advertising device based on multiple LTE-Dbeacons and WiFi beacons received from the advertising device. Operationproceeds from step 1214 to step 1216. In step 1216 the firstcommunications device changes a time spacing between a scan intervalused for periodically scanning for signals of the first type and a scaninterval used for periodically scanning for signals of the second typeor changes a time spacing between scan intervals used for periodicallyscanning for signals of the second type, based on one or more of thefollowing: said determined direction of motion relative to saidadvertising device, a route quality metric, e.g., a current routequality metric, a received signal strength of a second type signal,e.g., a received signal strength of said second second type signal, orcontent of a second type signal. In some embodiments, step 1216 includesstep 1218 in which the first communications device reduces the timespacing between scan intervals used for scanning for second type signalsfor at least some scan intervals. In some embodiments, when thedetermined direction of motion indicates that the first communicationsdevice is moving closer to the potential next hop device, the timespacing between scanning for second type signal is reduced to scan moreaggressively to quickly sense when the next hop device comes in range,e.g., WiFi range, of the first communications device. In someembodiments, the time spacing between scan intervals used for scanningfor second type signals for at least some scan intervals is reduced inresponse to a determination that the determined direction of motionrelative to the adverting device is a direction toward the advertisingdevice. In some embodiments, the time spacing between scan intervalsused for scanning for second type signals for at least some scanintervals is reduced in response to a determination that a receivedsignal strength of a second type signal is below a first threshold,e.g., start scanning aggressively to search for a new next hop devicewhen the second type signal from the current next hop device isdetermined to be fading. In some embodiments, the time spacing betweenscan intervals used for scanning for second type signals for at leastsome scan intervals is reduced in response to a determination that acurrent route quality metric is below a threshold, e.g., scanaggressively when the current route quality is determined to be below athreshold, said threshold being slightly above the route breakthreshold.

Operation proceeds from step 1216 to step 1220 in which the firstcommunications device continues scanning for first and second typesignals in accordance with the current time spacing information.Operation proceeds from step 1220 to the inputs of steps 1210 and 1212.

FIG. 13 is a drawing of an exemplary communications device 1300, e.g., auser equipment device in accordance with various exemplary embodiments.Exemplary communications device 1330 is, e.g., a communications devicewith device to device capability which can receive LTE-D beacons andWiFi beacons. Exemplary communications device 1300 is, e.g., acommunications device, e.g., a first communications device, implementingthe method of flowchart 600 of FIG. 6, the method of flowchart 700 ofFIG. 7, the method of flowchart 900 of FIG. 9, the method of flowchart1000 of FIG. 10, the method of flowchart 1100 of FIG. 11 and/or themethod of flowchart 1200 of FIG. 12.

Exemplary communications device 1300 includes an LTE network interface1302 including a LTE cellular interface 1304 and a LTE Direct (LTED)interface 1306, a WIFI network interface 1308, a Bluetooth (BT) networkinterface 1310, a Bluetooth low energy (BLE) network interface 1312,additional wireless interfaces 1313, e.g., other WPAN interfaces, etc.,a wired interface 1358, a 802.11 ad interface 1366, a 802.15.4 interface1372, a GPS Module 1380, an input device 1342, an output device 1344, aprocessor 1346, e.g., a CPU, a memory 1348, and an assembly of modules1350, e.g., an assembly of hardware modules, e.g., circuits, coupledtogether via a bus 1364 over which the various elements may interchangedata and information.

LTE cellular interface 1304 includes a cellular receiver (RX_(C)) 1314and a cellular transmitter (TX_(C)) 1316 coupled to antenna 1334, viawhich device 1300 may receive and transmit cellular wireless signals,respectively. LTE direct (LTE-D) interface 1306 includes a LTE directreceiver (RX_(LTED)) 1318 and a LTE direct transmitter (TX_(LTED)) 1320coupled to antenna 1334, via which device 1300 may receive and transmitLTE direct wireless signals, respectively. LTE direct wireless signalsinclude LTED beacons.

WIFI interface 1308 includes a WIFI receiver (RX_(WIFI)) 1322 and a WIFItransmitter (TX_(WIFI)) 1324 coupled to antenna 1336, via which device1300 may receive and transmit WIFI wireless signals, respectively. WIFIwireless signals include WIFI signals communicating WiFi beacon framesand WiFi action frames.

BT interface 1310 includes a BT receiver (RX_(BT)) 1326 and a BTtransmitter (TX_(BT)) 1328 coupled to antenna 1338, via which device1300 may receive and transmit BT wireless signals, respectively. BTwireless signals include BT beacons. BLE interface 1312 includes a BLEreceiver (RX_(BLE)) 1330 and a BLE transmitter (TX_(BLE)) 1332 coupledto antenna 1340, via which device 1300 may receive and transmit BLEwireless signals, respectively. BLE wireless signals include BLEbeacons. Additional interfaces 1313 includes one or more receivers andone or more transmitters and is coupled to antenna 1341, via whichdevice 1300 may receive and transmit wireless signals including beaconsignals. In some embodiments, a different number of antenna are usedand/or a different antenna configuration is used, e.g., a differentantenna for receive and transmit, multiple antennas for receive andmultiple antennas for transmit, the same antenna or same set of antennasfor different interfaces, etc. In some embodiments, different numbers ofantennas are used for at least some different interfaces.

Wired interface 1358 includes a receiver RX_(W) 1360 and a transmitterTX_(W) 1362, via which device 1300 may receive and transmit signals overthe Internet and/or to other network nodes, e.g., via a wired and/orfiber optic backhaul link or links. 802.11ad interface 1366 includes areceiver RX_(80211ad) 1368 and a transmitter TX_(80211ad) 1370, coupledto antenna 1369, via which device 1300 may receive and transmit signals,respectively, including, e.g. 802.11ad beacons.

802.15.4 interface 1372 includes a receiver RX₈₀₂₁₅₄ 1374 and atransmitter TX₈₀₂₁₅₄ 1376 coupled to antenna 1375 via which device 1300may receive and transmit signals, respectively, including, e.g.,802.15.4 beacons.

Input device 1342 includes, e.g., touch screen interface, keypad,keyboard, microphone, camera, switches, monitoring sensors, etc., viawhich a user of device 1300 may input information and/or device 1300 mayautonomously or semi autonomously collect data.

Output device 1344 includes, e.g., a display, a speaker, etc., foroutputting data/information to a user of device 1300. Memory 1348includes routines 1352 and data/information 1356. Routines 1352 includean assembly of modules 1354, e.g., an assembly of software modules.Data/information 1356 includes, e.g., received first and second typesignals, information received from received first and second type signalincluding infrastructure network connectivity information, generatedfirst, second, third and fourth type signals, updated networkconnectivity information, routing information, e.g. routing tableinformation, information identifying alternative gateways and qualityinformation associated with alternative gateways, a current routingpath, alternative routing paths, quality information associated with arouting path, determined direction information, and thresholds, e.g., aroute break threshold, a route quality threshold used for triggeringchanges in time spacing between scans for second type signals, areceived signal power threshold, e.g., corresponding to a receivedsecond type signal used for determining when to change time spacingbetween scans for second type signals.

FIG. 14 is a drawing of an assembly of modules 1400, which may beincluded in an exemplary communications device, e.g., communicationsdevice 1300 of FIG. 13, in accordance with an exemplary embodiment.Assembly of modules 1400 can, and in some embodiments is, used in thecommunications device 1300. The modules in the assembly of modules 1400can, and in some embodiments are, implemented fully in hardware withinthe processor 1346, e.g., as individual circuits. The modules in theassembly of modules 1400 can, and in some embodiments are, implementedfully in hardware within the assembly of modules 1350, e.g., asindividual circuits corresponding to the different modules. In otherembodiments some of the modules are implemented, e.g., as circuits,within the processor 1346 with other modules being implemented, e.g., ascircuits within assembly of modules 1350, external to and coupled to theprocessor 1346. As should be appreciated the level of integration ofmodules in the processor and/or with some modules being external to theprocessor may be one of design choice.

Alternatively, rather than being implemented as circuits, all or some ofthe modules may be implemented in software and stored in the memory 1348of the communications device 1300, with the modules controllingoperation of communications device 1300 to implement the functionscorresponding to the modules when the modules are executed by aprocessor, e.g., processor 1346. In some such embodiments, the assemblyof modules 1400 is included in the memory 1348 as assembly of modules1354. In still other embodiments, various modules in assembly of modules1400 are implemented as a combination of hardware and software, e.g.,with another circuit external to the processor providing input to theprocessor 1446 which then under software control operates to perform aportion of a module's function. While shown in the FIG. 13 embodiment asa single processor, e.g., computer, it should be appreciated that theprocessor 1346 may be implemented as one or more processors, e.g.,computers.

When implemented in software the modules include code, which whenexecuted by the processor 1346, configure the processor 1346 toimplement the function corresponding to the module. In embodiments wherethe assembly of modules 1400 is stored in the memory 1348, the memory1348 is a computer program product comprising a computer readable mediumcomprising code, e.g., individual code for each module, for causing atleast one computer, e.g., processor 1346, to implement the functions towhich the modules correspond.

Completely hardware based or completely software based modules may beused. However, it should be appreciated that any combination of softwareand hardware, e.g., circuit implemented modules may be used to implementthe functions. As should be appreciated, the modules illustrated in FIG.14 control and/or configure the communications device 1300 or elementstherein such as the processor 1346, to perform the functions ofcorresponding steps illustrated in the method of one or more of thesignaling drawings of FIG. 2, 3, 4, 5, 7, 8, and/or one or more of theflowcharts of FIGS. 6, 9, 10, 11 and 12, and/or described with respectto any of the Figures. Thus the assembly of modules 1400 includesvarious modules that perform functions of corresponding steps of one ormore of FIGS. 6, 9, 10, 11 and/or 12.

Assembly of modules 1400 includes a first type signal informationrecovery module 1402, a first type signal generation module 1404, and afirst type signal transmission control module. In various embodiments,the first communications device, e.g. device 1300 of FIG. 13, includesassembly of modules 1400 and further includes a first type signalinterface, e.g., an LTE-D interface 1306, configured to receive, e.g.,via its receiver, e.g., LTE-D receiver 1318, first type signalsincluding a first first type signal transmitted by an advertisingdevice, e.g., a gateway or an intermediate device that transmits a firsttype signal, e.g., an LTE-D beacon, said first first type signal, e.g,an LTE-D beacon, advertising infrastructure, e.g., cellular, e.g. LTEcellular, network connectivity information corresponding to theadvertising device. First type signal information recovery module 1402is configured to recover information communicated in a received firsttype signal, e.g., the first first type signal, said informationincluding infrastructure network connectivity information.

In various embodiments, the first type signal is a broadcast signal or amulticast signal. In some such embodiments, a first type signal is awireless broadcast signal communicating a beacon signal, e.g., a beaconframe. In various embodiments, the infrastructure network connectivityinformation includes quality information about a communication path usedby said advertising device to connect to the infrastructure network. Insome such embodiments, said quality information includes informationabout a connection between a gateway device used by the advertisingdevice and the infrastructure network. In some such embodiments, saidinfrastructure network connectivity information includes one or more ofthe following: information indicating a number of peer to peer hopsbetween the advertising device and the gateway device; information onquality of said peer to peer hops between the advertising device and thegateway device; information indicating a mobility level of theadvertising device; information identifying the infrastructure network,e.g. identifying the operator of the network; or information indicatinga type, e.g. number of antennas coupled to the gateway device, UEcategory, etc., of the gateway device.

In some embodiments, said connection is a single hop connection to theinfrastructure network. In some embodiments, said advertising device andsaid gateway are the same device, and wherein said path is a single hopconnection to the infrastructure network.

First type signal generation module 1404 is configured to generate firsttype signals, e.g., LTE-D beacons, said generated first type signalsincluding a second first type signal. In one example, the first typesignal generation module 1404 is configured to generate a second firsttype signal, e.g., an LTE-D beacon, based on information from thereceived first first type signal. In another example, the first typesignal generation module 1404 is configured to generate a second firsttype signal, e.g., an LTE-D beacon, based on information from thereceived first first type signal and information from the received firstsecond type signal. First type signal transmission control module 1406is configured to control the first type signal interface, e.g., LTE-Dsignal interface 1306, of first communications device to transmit agenerated first type signal, e.g., the second first type signal.Information included in the generated second first type signal includes,e.g., updated infrastructure network connectivity information. Thus thefirst type signal interface, e.g., LTE-D interface 1306, is configuredto transmit, e.g., via its transmitter, e.g., LTE-D transmitter 1320, asecond first type signal, e.g. an LTE-D beacon, advertising said updatednetwork connectivity information corresponding to the firstcommunications device.

Assembly of modules 1400 further includes a second type signal scaninitiation module 1408, a second type signal information recovery module1410, a second type signal generation module 1412 and a second typesignal transmission control module 1414. Second type signal scaninitiation module 1408 is configured to initiate scanning for a secondtype signal in response to receiving said first first type signal. Insome embodiments, the decision to scan is conditional based onadditional factors in addition to the reception of the first first typesignal. In various embodiments, the first communications device, e.g.device 1300 of FIG. 13, includes assembly of modules 1400 and furtherincludes a second type signal interface, e.g., WiFi interface 1308,configured to receive second type signals including a first second typesignal. In some embodiments, the first second type signal is a WiFibeacon communicating a WiFi beacon frame or a signal communicating aWiFi action frame. Second type signal information recovery module 1410is configured to recover information, e.g., network connectivityinformation, communicated in the received second type signals, e.g., thereceived first second type signal. Second type signal generation module1412 is configured to generate second type signals including a secondsecond type signal, e.g., a WiFi signal communicating a WiFi beaconframe a WiFi action frame, advertising updated network connectivityinformation corresponding to the first communications device. In variousembodiments, the generated second second type signal is based oninformation included in the received first first type signal and thereceived first second type signal.

The second type signal interface, e.g., WiFi interface 1308, is furtherconfigured to transmit generated second type signals, e.g., a secondsecond type signal, e.g., a WiFi signal communicating a WiFi beacon or aWiFi action frame, advertising updated network connectivity informationcorresponding to the first communications device. Second type signaltransmission control module 1414 is configured to control the secondtype signal interface, e.g., WiFi interface 1308, to transmit generatedsecond type signals including a generated second second type signal.

In some embodiments, a first type signal, e.g., a LTE-D beacon signal,has a longer transmission range than a second type signal, e.g., a WiFibeacon signal. In some embodiments, said first type signal is a wirelessbroadcast signal that corresponds to a first communications protocol,and said second type signal is a second wireless broadcast signal thatcorresponds to a second communications protocol. In some suchembodiments, the first communications protocol is an LTE-Dcommunications protocol and the second communications protocol is a WiFicommunications protocol.

In various embodiments, the first communications device, e.g. device1300 of FIG. 13, includes assembly of modules 1400 and further includesa third type signal interface, e.g., additional interface 1313,configured to transmit third type signals including a first third typesignal, e.g., a long range beacon which is a different type than anLTE-D beacon, advertising updated network connectivity informationcorresponding to the first communications device. Assembly of modules1400 further includes a third type signal generation module 1416 and athird type signal transmission control module 1418.Third type signalgeneration module 1416 is configured to generate third type signalsincluding a first third type signal advertising updated networkconnectivity information. Third type signal transmission control module1418 is configured to control the third type interface, e.g. interface1313, to transmit generated third type signals including the generatedfirst third type signal, e.g., a long range beacon advertising updatednetwork connectivity information corresponding to the firstcommunications device.

In various embodiments, the first communications device, e.g. device1300 of FIG. 13, includes assembly of modules 1400 and further includesa fourth type signal interface, e.g., one of: BT interface 1310, BLEinterface 1312, IEEE 802.11ad interface 1366, and 802.14.4 interface1372, configured to transmit fourth type signals including a firstfourth type signal, e.g., a short range beacon which is a different typethan a WiFi beacon, advertising updated network connectivity informationcorresponding to the first communications device. Assembly of modules1400 further includes a fourth type signal generation module 1419 and afourth type signal transmission control module 1420. Fourth type signalgeneration module 1419 is configured to generate fourth type signalsincluding a first fourth type signal advertising updated networkconnectivity information corresponding to the first communicationsdevice. Fourth type signal transmission control module 1420 isconfigured to control the fourth type interface to transmit generatedfourth type signals including the generated first fourth type signal,e.g., a short range beacon advertising updated network connectivityinformation corresponding to the first communications device.

Assembly of modules 1422 further includes a time reference module 1422,a monitoring decision module 1424, a monitoring trigger decision module1426, an infrastructure network connectivity information updating module1428, a handoff decision module 1430, a direction determination module1432, an a scan timing change module 1434. Time reference module 1422 isconfigured to maintain a time reference, e.g., one of a global orcellular time reference. In some embodiments, the global time referenceis a GPS time based on GPS signals received, e.g., via GPS receiver 1382of GPS module 1380. In various embodiments, a first type signal issynchronized to said time reference. In some such embodiments, a secondtype signal, e.g., a WiFi beacon signal, is unsynchronized orsynchronized to a lesser degree than a first type signal, e.g., a LTE-Dbeacon signal. In various embodiments, second type signals may havejitter or occur at less predictable times relative to a global timingreference than first type signals.

Monitoring decision module 1424 is configured to make a decision whetherto switch from monitoring for second type signals during monitoringintervals which occur at a first time spacing to monitoring, withoutwaiting for the occurrence of one of said monitoring intervals, e.g.,start monitoring immediately, for second type signals based on thecontent of said received first first type signal. In some suchembodiments, the monitoring decision module 1424 makes the decisionbased on whether infrastructure network connectivity informationincluded in the received first first type signal indicates betterinfrastructure network connectivity than is presently available to thefirst communications device.

Monitoring trigger decision module 1426 is configured to make a decisionwhether to trigger monitoring for second type signals based on whetheror not the infrastructure network connectivity information included inthe received first first type signal indicates better infrastructurenetwork connectivity than is presently available to the firstcommunications device. In some such embodiments, first and second typesignals are beacon signals, e.g., LTE-D beacon signals and WiFi beaconsignals. In some embodiments, the monitoring trigger decision module1426 is configured to decide to trigger monitoring when received networkconnectivity information indicates better infrastructure networkconnectivity than is presently available to the first communicationsdevice.

Infrastructure network connectivity updating module 1428 is configuredto update infrastructure network connectivity information correspondingto the first communications device based on information in said receivedfirst first type signal. Infrastructure network connectivity updatingmodule 1428 is further configured to update infrastructure networkconnectivity information corresponding to the first communicationsdevice based on information in said received first second type signal.

Handoff decision module 1430 is configured to make a decision whether tohandoff from another device to a second communications device based onsaid first second type signal received from the second communicationsdevice.

Direction determination module 1432, in some embodiments, is configuredto determine a direction of motion of said first communications devicerelative to said advertising device based on at least one signalreceived from the advertising device. For example, the directiondetermination module 1432 determines a direction of motion based on (i)said first first type signal, e.g., an LTE-D beacon, received from theadvertising device and (ii) other first type signals, e.g., other LTE-Dbeacons, received from the advertising device. In another example, thedirection determination module 1432 determines a direction of motionbased on multiple second type signals, e.g., multiple WiFi beacons,received from the advertising device. In still another example, thedirection determination module 1432 determines a direction of motionbased on multiple first type signals, e.g., LTE-D beacons, and multiplesecond type signals, e.g., multiple WiFi beacons, received from theadvertising device.

Direction determination module 1432, in some embodiments, is configuredto determine a direction of motion of said first communications devicerelative to said advertising device based on one or more signals, e.g.,one or more signals received from the advertising device. In some suchembodiments, the one or more signals are: multiple LTE-D beaconsreceived from the advertising device, multiple WiFi beacons receivedfrom the advertising device, or multiple LTE-D and WiFi beacons receivedfrom the advertising device.

Scan timing change module 1434 is configured to change: (i) a timespacing between a scan interval used for periodically scanning forsignals of the first type, e.g., LTE-D beacons, and a scan interval usedfor scanning for signals of the second type, e.g., WiFi beacons, or (ii)a time spacing between scan intervals used for periodically scanning forsignals of the second type, e.g., WiFi beacons, based on one or more ofthe following: (i) a determined direction of motion of said firstcommunications device relative to said advertising device, (ii) areceived signal strength of said second type signal, or (iii) content ofsaid second type signal. For example, in one embodiment, as the firstcommunications device moves closer to the potential next hop device anddetermines that the direction of motion is toward the advertisingdevice, the scan timing change module 1434 reduces the time spacingbetween second type scan intervals to scan more aggressively so that thefirst communications device can quickly sense when it comes into WiFirange.

In some embodiments, the scan timing change module 1434 is configured tochange the time spacing between scan intervals used for scanning forsignals of the second type to reduce the time spacing between at leastsome scan intervals in response to a set of conditions being satisfied,said set of conditions including said determined direction of motionrelative to the advertising device being a direction toward theadvertising device.

In some embodiments, the scan timing change module 1434 is configured tochange the time spacing between scan intervals used for scanning forsignals of the second type to reduce the time spacing between at leastsome scan intervals in response to a set of conditions being satisfied,said set of conditions including said determined direction of motionrelative to the advertising device being said received signal strengthof a second type signal being above a first threshold. For example, thescan timing change module 1434 changes the scan timing to scan moreaggressively when approaching the connection threshold.

Assembly of modules 1400 further includes a first type beacon monitoringmodule 1436, a first type beacon receive module 1438, a new informationdetermination module 1440, a top gateway information updating module1442, a second type interface scan initiation module 1444, a second typeinterface scan module 1446, a second type interface beacon receivemodule 1450, an updated information determination module 1452, a scantimeout determination module 1454, a hop count updating module 1456, asecond type beacon generation module 1458, and a second type beacontransmission control module 1460.

First type beacon monitoring module 1436 is configured to monitor forfirst type beacons, e.g. LTE-D beacons, e.g., in accordance with firsttype beacon monitoring intervals synchronized with respect to a globalor cellular time reference. First type beacon receive module 1438 isconfigured to receive first type beacons, e.g., LTE-D beaconsadvertising infrastructure network connectivity information and recoverinformation communicated in a received first type beacon. Newinformation determination module 1440 is configured to determine if thereceived first type beacon carries new information and to controloperation as a function of the determination. Top gateway informationupdating module 1442 is configured to update information about thecurrent top gateway based on information in the received first typebeacon when the new information determination module determines that thereceived first type beacon carries new information about the current topgateway. Second type interface scan initiation module 1444 is configuredto initiate, e.g., trigger immediate, scanning on a second interface,e.g., a WiFi interface in response to receiving a first type beaconcarrying new information about the current top gateway. Second typeinterface scan module 1446 is configured to perform the scan on thesecond type interface in response to the scan initiation. Scan timeoutdetermination module 1454 is configured to determine when the timeinterval for the scan is completed and control operation as a functionof the determination. A second type interface beacon signal, e.g., aWiFi beacon may be, and sometime is, received during the scan before thetimeout occurs.

Second type interface beacon receive module 1450 is configured toreceive a second type beacon signal, e.g., a WiFi beacon signal,detected during the scan, and recover information communicated in thereceived second type beacon signal.

Updated information determination module 1452 is configured to determineif a second type beacon with updated information was received during thescan on the second interface, e.g., the WiFi interface, and to controloperation as a function of the determination. Hop count updating module1456 is configured to update the hop count to the current top gatewaybased on information received in the second type beacon. Second typebeacon generation module 1458 is configured to generate a second typebeacon, e.g., a WiFi beacon communicating updated infrastructure networkconnectivity information based on information received in a first typebeacon signal, e.g. an LTE-D beacon, and a second type beacon, e.g., aWiFi beacon. Second type beacon transmission control module 1460 isconfigured to control the second type interface, e.g., WiFi interface,to transmit the generated second type beacon, e.g., generated WiFibeacon, with the updated information.

Assembly of modules 1400 further includes a beacon monitoring module1462, a beacon receive module 1464, a received signal strengthmeasurement module 1466, a relative motion determination module 1468, aninformation storage module 1470, a route quality determination module1472, a route quality ranking module 1474, a current route qualityevaluation module 1476, an alternative route availability determinationmodule 1478, a second type signal higher quality availabilitydetermination module 1479, a second type signal scan initiation module1480, a second type signal scan module 1482, a second type signalreceive module 1484, a second type signal higher quality routeinformation determination module 1486, a scan timeout module 1488, a newconnection initiation module 1490 and a handover module 1492.

Beacon monitoring module 1462 is configured to monitor for beacons fromother devices, e.g., LTE-D and WiFi beacons. Beacon receive module 1464is configured to receive beacons, e.g., LTE-D and WiFi beacons fromanother device. Received signal strength measurement module 1466 isconfigured to receive the signal strength of received signals, e.g., thesignal strength of received LTE-D beacons and WiFi beacons. In variousembodiments, the transmission power corresponding to the receivedbeacons is known or can be determined.

Relative motion determination module 1468 is configured to determine arelative motion of the first communications device including assembly ofmodules 1400 and the other device which transmitted the receivedbeacons, based on a sequence of received signal strength measurements.Information storage module 1470 is configured to store relative motioninformation and other information communicated in received beaconsfields, e.g., other information including network connectivityinformation, in memory.

Route quality determination module 1472 is configured to compute thequality of routes, e.g., alternative routes including the current route,in a routing table. Route quality ranking module 1474 is configured torank the quality of alternative routes in the routing table. Currentroute evaluation module 1476 is configured to determine if the qualityof the current route is below a threshold and to control operation as afunction of the determination. Alternative route availabilitydetermination module 1478 is configured to determine if there arealternative routes with higher quality than the current route when thecurrent route quality evaluation module 1476 determines that the qualityof the current route is the below the threshold. Second type signalhigher quality availability determination module 1479 is configured todetermine if second type signal, e.g., WiFi, information is available onany higher quality route and to control operation as a function of thedetermination. New connection initiation module 1440 is configured tostart a connection procedure for the best alternative route using thesecond type signal, e.g., WiFi signal, information, when module 1479determines that second type signal, e.g.. WiFi signal, information of ahigher quality route is available.

Second type signal scan initiation module 1480 is configured to initiatea scan for second type signal, e.g., WiFi signal, when module 1479determines that second type signal information on a higher quality routeis not available. Second type signal scan module 1482 is configured toperform the monitoring for second type signal, e.g., monitoring for WiFibeacon signals WiFi action frames, communicating information on a higherquality route. Second type signal, e.g., WiFi, receive module 1482 isconfigured to receive second type signals. Second type signal higherquality route information determination module 1486 is configured todetermine if second type signal information, e.g. WiFi information, of ahigher quality route has been received during the scanning and tocontrol operation as a function of the determination. Scan timeoutmodule 1488 is configured to determine when the initiated scan forsecond type signals, e.g. WiFi scan, has timed out and to controloperation as a function of the determination. New connection initiationmodule 1490 is further configured to start a connection procedure forthe higher quality route using the second type signal, e.g., a WiFisignal, information in response to a determination by module 1486 thatsecond type signal information has been received with information of ahigher quality route than the current route. Handover module isconfigured to implement a handover which has been started by newconnection initiation module 1490.

The techniques of various embodiments may be implemented using software,hardware and/or a combination of software and hardware. Variousembodiments are directed to communications devices included in networks,e.g., device to device networks which include gateway devices andsupport multiple applications. Various embodiments are directed toapparatus, e.g., a communications device such as a wireless device,e.g., a UE, a smart device, Internet of Things device, including awireless communications interface, a device including an Ethernetswitch, a gateway device, a base station, etc. Various embodiments, arewell suited for wireless communications systems supporting D2D signalingincluding beacons and different technologies, e.g., in combination,e.g., LTE-D and at least one of WWI, BT, BLE, IEEE 802.15.4, and IEEE802.11ad. Various embodiments are well suited for use in systemsincluding device to device communications networks which use gatewaysand may include a plurality of network segments, e.g., disjoint networksegments each network segment associated with a gateway. Variousembodiments are directed to communications systems. Various embodimentsare also directed to methods, e.g., a method of operating acommunications device. Various embodiments are well suited forembodiments, in which communications devices supports a plurality ofcommunications applications. Various embodiments are also directed tomachine, e.g., computer, readable medium, e.g., ROM, RAM, CDs, harddiscs, etc., which include machine readable instructions for controllinga machine to implement one or more steps of a method. The computerreadable medium is, e.g., non-transitory computer readable medium.

It is understood that the specific order or hierarchy of steps in theprocesses disclosed is an example of exemplary approaches. Based upondesign preferences, it is understood that the specific order orhierarchy of steps in the processes may be rearranged while remainingwithin the scope of the present disclosure. The accompanying methodclaims present elements of the various steps in a sample order, and arenot meant to be limited to the specific order or hierarchy presented.

In various embodiments nodes described herein are implemented using oneor more modules to perform the steps corresponding to one or moremethods, for example, making a connection establishment decision,selecting a communications device, identifying a gateway used by acommunications device, making a routing decision, implementing adecision, signal generation, signal transmission, signal reception,signal processing, and/or other steps. Thus, in some embodiments variousfeatures are implemented using modules. Such modules may be implementedusing software, hardware or a combination of software and hardware. Manyof the above described methods or method steps can be implemented usingmachine executable instructions, such as software, included in a machinereadable medium such as a memory device, e.g., RAM, floppy disk, etc. tocontrol a machine, e.g., general purpose computer with or withoutadditional hardware, to implement all or portions of the above describedmethods, e.g., in one or more nodes. Accordingly, among other things,various embodiments are directed to a machine-readable medium, e.g., anon-transitory computer readable medium, including machine executableinstructions for causing a machine, e.g., processor and associatedhardware, to perform one or more of the steps of the above-describedmethod(s). Some embodiments are directed to an apparatus, e.g., acommunications device such as a wireless device, e.g., a UE, including aprocessor configured to implement one, multiple or all of the steps ofone or more methods of the invention.

In some embodiments, the processor or processors, e.g., CPUs, of one ormore devices, e.g., of a communications device such as a wirelessdevice, e.g., a UE, smart communications device, a base station, agateway, etc. are configured to perform the steps of the methodsdescribed as being performed by the apparatus. The configuration of theprocessor may be achieved by using one or more modules, e.g., softwaremodules, to control processor configuration and/or by including hardwarein the processor, e.g., hardware modules, to perform the recited stepsand/or control processor configuration. Accordingly, some but not allembodiments are directed to a device, e.g., such as communicationsdevice with a processor which includes a module corresponding to each ofthe steps of the various described methods performed by the device inwhich the processor is included. In some but not all embodiments anapparatus, e.g., a communications device includes a module correspondingto each of the steps of the various described methods performed by thedevice in which the processor is included. The modules may beimplemented using software and/or hardware.

Some embodiments are directed to a computer program product comprising acomputer-readable medium, e.g., a non-transitory computer-readablemedium, comprising code for causing a computer, or multiple computers,to implement various functions, steps, acts and/or operations, e.g. oneor more steps described above. Depending on the embodiment, the computerprogram product can, and sometimes does, include different code for eachstep to be performed. Thus, the computer program product may, andsometimes does, include code for each individual step of a method, e.g.,a method of controlling a communications device. The code may be in theform of machine, e.g., computer, executable instructions stored on acomputer-readable medium, e.g., a non-transitory computer-readablemedium, such as a RAM (Random Access Memory), ROM (Read Only Memory) orother type of storage device. In addition to being directed to acomputer program product, some embodiments are directed to a processorconfigured to implement one or more of the various functions, steps,acts and/or operations of one or more methods described above.Accordingly, some embodiments are directed to a processor, e.g., CPU,configured to implement some or all of the steps of the methodsdescribed herein.

Various features are directed to a system including multiplecommunications devices including, for example, multiple wirelessdevices, e.g., multiple UEs including multiple interfaces and thecapability to send and received two or more different types of beacons,multiple gateways, multiple base station, etc. Some devices may benetwork nodes, e.g. infrastructure network nodes. Some of the devicesmay be stationary wireless communications devices; other devices may bemobile wireless devices. Some communications devices may be usercommunications devices, while other devices may be smart communicationsdevices which operate without user input, e.g., in response to sensordetection. In various embodiments the communications devices and/ornetwork nodes or entities are implemented as hardware, e.g., separatedevices each including a communications interface for sending and/orreceiving signals communicating data or other information, one or moreprocessors and memory. In some embodiments the memory includes dataand/or control routines. In at least some embodiments the one or moreprocessors operate under control instructions in the control routine orroutines stored in the node's memory. Thus, when executed by theprocessor, the instructions in the node or other network entity toperform the functions in accordance with one or more of the methodsdescribed herein. In some embodiments the processor or processors ofindividual nodes are special purposed processors, e.g., ASICs, withhardware circuitry which is configured to implement or control the nodeor network entity in which the special purpose processor is located toimplement one or more steps in accordance with a method or methodsdescribed herein. In at least some embodiments, circuits and/or otherhardware are used to implement the node or method resulting in a fullyhardware implemented embodiment.

Numerous additional variations on the methods and apparatus of thevarious embodiments described above will be apparent to those skilled inthe art in view of the above description. Such variations are to beconsidered within the scope. Numerous additional embodiments, within thescope of the present invention, will be apparent to those of ordinaryskill in the art in view of the above description and the claims whichfollow. Such variations are to be considered within the scope of theinvention.

What is claimed is:
 1. A communications method of operating a firstcommunications device, the method comprising: receiving a first firsttype signal transmitted by an advertising device, said first first typesignal advertising infrastructure network connectivity informationcorresponding to the advertising device; and initiating scanning for asecond type signal in response to receiving said first first typesignal.
 2. The method of claim 1, wherein said infrastructure networkconnectivity information includes quality information about acommunication path used by said advertising device to connect to theinfrastructure network.
 3. The method of claim 2, wherein said qualityinformation includes information about a connection between a gatewaydevice used by the advertising device and the infrastructure network. 4.The method of claim 3, wherein said infrastructure network connectivityinformation includes one or more of the following: informationindicating a number of peer to peer hops between the advertising deviceand the gateway device; information on quality of said peer to peer hopsbetween the advertising device and the gateway device; informationindicating a mobility level of the advertising device; informationidentifying the infrastructure network; or information indicating a typeof the gateway device.
 5. The method of claim 1, wherein a first typesignal has a longer transmission range than a second type signal.
 6. Themethod of claim 5, wherein said first type signal is a wirelessbroadcast signal that corresponds to a first communications protocol andsaid second type signal is a second wireless broadcast signal thatcorresponds to a second communications protocol.
 7. The method of claims6 wherein said first type signal is synchronized to a time reference;and wherein said second type signal is unsynchronized or synchronized toa lesser degree than said first type signal.
 8. The method of claim 1,further comprising: making a decision whether to switch from monitoringfor second type signals during monitoring intervals which occur at afirst time spacing to monitoring, without waiting for the occurrence ofone of said monitoring intervals, for second type signals based on thecontent of said received first first type signal.
 9. The method of claim1, further comprising: updating infrastructure network connectivityinformation corresponding to the first communications device based oninformation in said received first first type signal.
 10. The method ofclaim 9, further comprising: receiving a first second type signal; andupdating infrastructure network connectivity information correspondingto the first communications device based on information in said receivedfirst second type signal.
 11. The method of claim 1, further comprising:receiving a first second type signal from a second communicationsdevice; and making a decision whether to handoff from another device tosaid second communications device based on said first second type signalreceived from the second communications device.
 12. The method of claim11, further comprising: determining a direction of motion relative tosaid advertising device based on at least one signal received from theadvertising device; and wherein said decision whether to handoff isbased on said determined direction of motion relative to saidadvertising device in addition to being based on said first second typebroadcast signal.
 13. The method of claim 1, further comprising: afterreceiving the first first type signal transmitted by the advertisingdevice, determining a direction of motion relative to said advertisingdevice based on one or more signals; and changing a time spacing betweena scan interval used for periodically scanning for signals of the firsttype and a scan interval used for periodically scanning for signals ofthe second type or changing a time spacing between scan intervals usedfor periodically scanning for signals of the second type, based on oneor more of the following: said determined direction of motion relativeto said advertising device, a current route quality metric, a receivedsignal strength of said second type signal, or content of a receivedsecond type signal.
 14. A first communications device (1300) comprising:a first type signal interface (1306) configured to receive a first firsttype signal transmitted by an advertising device, said first first typesignal advertising infrastructure network connectivity informationcorresponding to the advertising device; a first type signal informationrecovery module (1402) configured to recover information communicated inreceived first first type signal, said information includinginfrastructure network connectivity information; and a second typesignal scan initiation module (1408) configured to initiate scanning fora second type signal in response to receiving said first first typesignal.
 15. The first communications device (1300) of claim 14, whereinsaid infrastructure network connectivity information includes qualityinformation about a communication path used by said advertising deviceto connect to the infrastructure network.
 16. The first communicationsdevice (1300) of claim 14, further comprising: a monitoring decisionmodule (1424) configured to make a decision whether to switch frommonitoring for second type signals during monitoring intervals whichoccur at a first time spacing to monitoring, without waiting for theoccurrence of one of said monitoring intervals, for second type signalsbased on the content of said received first first type signal.
 17. Thefirst communications device (1300) of claim 14, further comprising: aninfrastructure network connectivity information updating module (1428)configured to update infrastructure network connectivity informationcorresponding to the first communications device based on information insaid received first first type signal.
 18. The first communicationsdevice (1300) of claim 14, further comprising: a second type signalinterface (1308) configured to receive a first second type signal from asecond communications device; and a handoff decision module (1430)configured to make a decision whether to handoff from another device tosaid second communications device based on said first second type signalreceived from the second communications device.
 19. The firstcommunications device (1300) of claim 14, further comprising: adirection determination module (1432) configured to determine adirection of motion relative to said advertising device based on one ormore signals; and a scan timing change module (1434) configured tochange a time spacing between a scan interval used for periodicallyscanning for signals of the first type and a scan interval used forperiodically scanning for signals of the second type or changing a timespacing between scan intervals used for periodically scanning forsignals of the second type, based on one or more of the following: saiddetermined direction of motion relative to said advertising device , aroute quality metric, a received signal strength of a second typesignal, or content of a received second type signal.
 20. Anon-transitory machine readable medium (1348) including processorexecutable instructions which when executed by a processor (1346) of afirst communications device (1300), control the first communicationsdevice (1300) to perform the steps of: receiving a first first typesignal transmitted by an advertising device, said first first typesignal advertising infrastructure network connectivity informationcorresponding to the advertising device; and initiating scanning for asecond type signal in response to receiving said first first typesignal.